This function receives the main.c binary file path in the command line parameter, then reads the contents of this file, puts it into the buffer character array, adds the terminator ” at the end, converts it to a string and returns it.

static char* readFile(const char* path) {
    FILE* file = fopen(path, "rb");
    if (!file) {
        fprintf(stderr, "Could not open file " %s ".n", path);
        exit(1);
    }

    fseek(file, 0L, SEEK_END);
    size_t fileSize = ftell(file);
    rewind(file);

    char* buffer = (char*)malloc(sizeof(char) * (fileSize + 1));
    if (!buffer) {
        fprintf(stderr, "Not enought memory to read %s".n", path);
        exit(1);
    }

    size_t bytesRead = fread(buffer, sizeof(char), fileSize, file); // ERROR!!!

    if (bytesRead < fileSize) {
        fprintf(stderr, "Could not read file "%s".n", path);
        exit(1);
    }
    buffer[bytesRead] = '';
    
    fclose(file);
    return buffer;
}

Statements that cause exceptions: size_t bytesRead = fread(buffer, sizeof(char), fileSize, file);

The fread function throws an exception when reading a binary file. I tried forcing type conversion on fileSize, but it doesn’t seem to be a type problem. fileSize can correctly receive the number of bytes in the file. I really don’t know how to correct it.